Physics

• rest mass

  (physics) the mass of a body as measured when the body is at rest relative to an observer,...

• relativistic mass

  (physics) the mass of a body in motion relative to the observer: it is equal to...

• gravitational mass

  (physics) the mass of a body as measured by its gravitational attraction for...

• inertial mass

  (physics) the mass of a body as determined by the second law of motion from the acceleration...

• mass energy

  (physics) the mass of a body regarded relativistically as energy.

Chemistry

• atomic mass

  (chemistry) the mass of an atom of a chemical element expressed in atomic mass unit...

• molecular weight

  (chemistry) the sum of the relative atomic masses of the constituent atoms of a...

Also contains

• mass defect

  The amount by which the mass of an atomic nucleus is less than the sum of the masses...

• body

  The main mass of a thing.

• biomass

  The total mass of living matter in a given unit area.

• critical mass

  The minimum mass of fissionable material that can sustain a chain reaction.

• bulk

  The property possessed by a large mass.